Added warning on Katana cookies issue
Added warning on Katana cookies issue

Microsoft's OWIN implementation for ASP.Net has a bug that clears authentication cookies on occasions (not always, which makes it difficult to troubleshoot). This change includes a workaround.
yvonnewilson/docs,jeffreylees/docs,auth0/docs,khorne3/docs,Catografix/docs,Annyv2/docs,khorne3/docs,jeffreylees/docs,Annyv2/docs,Annyv2/docs,yvonnewilson/docs,auth0/docs,sandrinodimattia/docs,yvonnewilson/docs,Catografix/docs,khorne3/docs,auth0/docs,hamzawi06/docs,hamzawi06/docs,Catografix/docs,sandrinodimattia/docs,sandrinodimattia/docs,hamzawi06/docs,jeffreylees/docs